# File lib/facter/core/directed_graph.rb, line 29 def tsort missing = Set.new(self.values.flatten) - Set.new(self.keys) if not missing.empty? raise MissingVertex, "Cannot sort elements; cannot depend on missing elements #{missing.to_a}" end super rescue TSort::Cyclic raise CycleError, "Cannot sort elements; found the following cycles: #{cycles.inspect}" end